초록 ▼

A filter membrane for filtering liquid food stuffs or hot gases and including at least one filter layer. The membrane is constituted by a sintered inorganic material comprising grains which are fixedly connected to one another and the average roughness of the surface of said filter layer over a dist

A filter membrane for filtering liquid food stuffs or hot gases and including at least one filter layer. The membrane is constituted by a sintered inorganic material comprising grains which are fixedly connected to one another and the average roughness of the surface of said filter layer over a distance along said surface equal to at least five times the average grain size is less than one fifth of the average grain size in the region in question.

대표청구항 ▼

A filter membrane including at least one filter layer having an exposed surface and being composed of a sintered inorganic material in the form of grains which are fixedly connected to one another, said inorganic material being selected from the group consisting of metal oxides, silicon carbide, sil

A filter membrane including at least one filter layer having an exposed surface and being composed of a sintered inorganic material in the form of grains which are fixedly connected to one another, said inorganic material being selected from the group consisting of metal oxides, silicon carbide, silicon nitride, silicon and aluminum oxynitrides (SiALON), borides, and glasses, wherein the improvement comprises the filter layer having been formed by depositing onto a porous support layer a thin slip consisting essentially of a thoroughly deflocculated suspension of fine grains of said organic material in a liquid vehicle, together with a dispersing agent in an amount sufficient to obtain thorough deflocculation of said grains and a thickening agent which does not hinder deflocculation, the porous support layer having pores of greater size than said filter layer, draining off excess slip so as to leave a thin uniform layer on the support, and baking the filter membrane at a temperature sufficient to sinter the grains of the inorganic material, such that the average roughness of the surface of said sintered filter layer over a distance along said surface equal to at least five times the average grain size is less than one fifth of the average grain size in the region in question.